diff --git a/global.go b/global.go
index cb96e08..cd00aae 100644
--- a/global.go
+++ b/global.go
@@ -668,7 +668,7 @@ func newContext() *_runtime {
 		"RegExp", builtinRegExp,
 		builtinNewRegExp,
 		self.Global.RegExpPrototype,
-		"toString", 0, builtinRegExp_toString,
+		"toString", -0xff, builtinRegExp_toString,
 		"exec", -1, builtinRegExp_exec,
 		"test", -1, builtinRegExp_test,
 	)
@@ -829,6 +829,10 @@ func (runtime *_runtime) newNativeFunction(_nativeFunction _nativeFunction, leng
 	// TODO Do this a better way...
 	if 0 > length {
 		length *= -1
+		// TODO Achk... hack
+		if length == 0xff {
+			length = 0
+		}
 		prototype = false
 	}
 	self := runtime.newNativeFunctionObject(_nativeFunction, length, name)
diff --git a/regexp_test.go b/regexp_test.go
index 93f2abb..afee5be 100644
--- a/regexp_test.go
+++ b/regexp_test.go
@@ -139,6 +139,14 @@ func TestRegExp_test(t *testing.T) {
 	test(`RegExp.prototype.test.prototype`, "undefined")
 }
 
+func TestRegExp_toString(t *testing.T) {
+	Terst(t)
+
+	test := runTest()
+	test(`RegExp.prototype.toString.length`, "0")
+	test(`RegExp.prototype.toString.prototype`, "undefined")
+}
+
 func TestRegExp_zaacbbbcac(t *testing.T) {
 	Terst(t)